Rust detection | Atego 4×4

As an older truck have some rusty spots.I´m wandering what treatment is the best one for me.Have a very good experience with Dinitrol stuff, but always used only as a prevention (new cars).Hope my condition is satisfactory and sand blasting will avoid.Anyway I’m dreaming about perfect coating to have no problems in the future.If you have some proven procedure, please share with me …. thanks